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<TITLE>Generating a Random Number
(Java Developers Almanac Example)
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<h3>
e331.
Generating a Random Number</h3>
<pre>
Random rand = new Random();
// Random integers
int i = rand.nextInt();
// Continually call nextInt() for more random integers ...
// Random integers that range from from 0 to n
int n = <font color="#0066ff"><i>10</i></font>;
i = rand.nextInt(n+1);
// Random bytes
byte[] bytes = new byte[<font color="#0066ff"><i>5</i></font>];
rand.nextBytes(bytes);
// Other primitive types
boolean b = rand.nextBoolean();
long l = rand.nextLong();
float f = rand.nextFloat(); // 0.0 <= f < 1.0
double d = rand.nextDouble(); // 0.0 <= d < 1.0
// Create two random number generators with the same seed
long seed = rand.nextLong();
rand = new Random(seed);
Random rand2 = new Random(seed);
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Related Examples
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e332. <a class="eglink" href="ParseString.html?l=rel">
Breaking a String into Words
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e333. <a class="eglink" href="CustEvent.html?l=rel">
Creating a Custom Event
</a>
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e334. <a class="eglink" href="Obs.html?l=rel">
Implementing a Simple Event Notifier
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e335. <a class="eglink" href="GetAllLocales.html?l=rel">
Listing All Available Locales
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e336. <a class="eglink" href="SetDefLocale.html?l=rel">
Setting the Default Locale
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e337. <a class="eglink" href="ValueOnObj.html?l=rel">
Associating a Value with an Object
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See also:
<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Arrays">
Arrays
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Bits">
Bits
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Collections">
Collections
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Dates">
Dates
</a>
<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Hash%20Tables">
Hash Tables
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Lists">
Lists
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Property%20Files">
Property Files
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Sets">
Sets
</a>
<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Sorted%20Collections">
Sorted Collections
</a>
<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Time">
Time
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<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Timers">
Timers
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